OK, with the addition of a Grand Trunk Double, I thought that I'd do a brief review of these three hammocks. All were purchased new by me.
The ENO double lists for about $65. The Grand Trunk double lists for about $65. Both of these are available from retail stores and the internet. The Kammock Roo lists for $99 and is only available through their website at this time.
I found that the carabiners on the ENO double were identical to those spec'd on the Grand Trunk Parachute double. Both were basically steel with a coating. The coating tarnished in the wet weather and wore through quickly on my first ENO. On the other hand, the Kammok came with aluminum wiregate carabiners. Not quite as large or hefty as the other two. Rather light and strong; in other words, a definite upgrade!
The whipped ends of all three had various pieces of heavy rope to hold them shut, which I promptly changed out for whoopies. However, when I went to switch out the Kammok one, I found that they had actually sewn the double loop around the biner closed, so that it wouldn't come apart. I had to cut this heavy thread to undo it. This showed a lot more attention to detail on this part by Kammok.
The next thing that I checked was the stitching. All three hammocks had a central panel color with bands sewn along the outside edges. All three hammock manufacturers put a triple stitch in to bond the outside fabric edges to the inside panel fabric.
I found that the ENO and GT both had a single stitch line sewing up the outside edge of the additional fabric. It was folded over twice with a single stitch put in. On the other hand, Kammok went and did a heavy duty triple stitch along the outside edge of the outside fabric.
According to factory specs, the ENO Double was 9'4" by 6'8"; the GT Double was 10'6" by 6'6"; the Kammok was said to be 10' by 5'7". When I put up the three hammocks together in various ways, I found that the ENO double proved to be the shortest. The GT Double was the next longest. The Kammok was longer than the other two, despite the manufacturers specs. I believe that this is due to GT including their rope in the overall length calculation. Checking the width, I found the Kammok was the narrowest. The ENO double was about 6" wider and the GT double was about another 6" wider than the ENO.
The three manufacturers all had bags with the hammocks. The GT was a basic stuff sack with a draw string. The ENO was a stuff sack with draw string and it had a quick connect buckle that synched down to compress the bag. The Kammok had a stuff sack with a draw string. Above that was a roll top closure which then tucked down into two quick connects that synched down to compress the bag. I'm not sure if it had a DWR, but it didn't feel like silnylon.
Finally, the biggest difference was the fabric. Both the ENO and the GT come in a range of color combinations. The Kammok was available in only one color; however, I see that they now offer a total of four colors. The ENO has a very soft nylon material. The GT has a similar material, which does not feel as soft as the ENO's. The Kammok has a nylon ripstop material, which appears heavier duty than the other two. It actually has a rather unique triangle shaped ripstop fabric.
On the scale with the carabiners removed and the ends switched out for identical whoopies, I found that the ENO came out at roughly 17.5 oz, the GT was about 18.5 oz and the Kammok was about 20.5 oz.
On a side note, the ENO came with no straps. Their nylon Slap Strap Pros are infamous for stretching during use. The GT came with ropes; however, I immediately put them aside. The Kammok came with no straps, either. However, I purchased the poly "Python" straps ($30). They were basically a poly strap folded in half and sewn every 6". They cost about $5 more than the ENO Slap Straps Pro. I found the Kammok Python straps to be too heavy for backpacking (hence, switching out to whoopies), but they are perfect for car camping. Very easy to use, adjustable, and they don't stretch.
In use, I found that the width of the hammock didn't matter as much as the effect that the length had. To me, the Kammok allowed the best diagonal lay & most comfort. This was followed up by the GT and then the ENO.
All three hammocks are nice in use. I would not have a problem purchasing any of the three again. But, given the details listed above, if I was in the market for only ONE hammock, it would be the Kammok, despite the extra $34 cost. The stitching was higher quality all the way around, the fabric was more comfortable feeling and cooler looking, the carabiners were of a higher quality, and the stuff sack was nicer. Above all, I found the comfort of the Kammok superior to the other two.